Electric Toothbrush Blog

Wireless charging electric toothbrush solution-Aiwejay

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    wireless charging electric toothbrush solution, High integration of chip and Circuit circuits, reducing BOM cost, low-cost mass production

    Internal structure of electric toothbrush
    Internal structure of electric toothbrush

     

    Electric toothbrushes are new products that have emerged in recent years. Compared with ordinary toothbrushes, electric toothbrushes are more scientific and effective. Electric toothbrushes produce high-frequency vibrations in the brush head through the rapid rotation or vibration of the motor core.
    Electric toothbrushes have cleaning ability and feel Comfort, fun experience, reduced damage, whitening and beauty, and ease of use are six major advantages. However, electric toothbrushes are often exposed to water and have high requirements for waterproofing. Most electric toothbrushes need to be equipped with wireless charging.

     

    Wireless charging circuit board design
    Wireless charging circuit board design

    1. Program introduction

     

    1.1 Wireless charging transmitter

     
    Receive and decode RX command
    Control and adjust output power
     

    1.2 Wireless charging receiver and toothbrush control

     
    Use wireless charging
    Send RX command to feedback charging current
    Lithium battery charge and discharge management
    Mode and power management
    MOS full-bridge motor drive circuit
    Adjustable motor frequency and strength, multiple working modes
     

    1.3 Wireless charging parameters

     
    TX coil diameter 15mm
    RX coil diameter 13mm
    Coil copper wire diameter 0.2mm*2
    Coil Q value 30 (test conditions 100KHZ/1V)
    Coil inductance 15uH
    Rated charging current 120mA
     

    2. MCU specifications

     
    N76E885AT20/28
    • 1T 8051 Core MCU
    •18KB Flash
    • 1KB SRAM
    • Working frequency up to 25MHz
    • Working voltage 2.4V~5.5V
    •Working temperature -40 ℃~105 ℃
    • TSSOP20/28 package
    • 10-channel 10-bit ADC, conversion speed up to 300KHz
    • 8-channel 12-bit PWM, clock up to 25MHz
     
    Wireless Charging UW01 Lite
    Wireless Charging UW01 Lite

    3. Advantages of Aiwejay wireless charging electric toothbrush solution

    RX-side MCU integrates three functions of wireless charging and receiving, battery charging and discharging management and toothbrush motor control, single-chip solution
    TX-side MCU integrates three functions of wireless charging transmission, charging current feedback analysis and charging power adjustment, single-chip solution
    TX end has over-current protection function, TX and RX end can be added with over-temperature and over-current protection functions according to customer needs
    The TX end can adjust the output power to facilitate mass production and reduce the impact of the system due to the consistency errors of other components
    High integration of X and RX circuits, reducing BOM cost

    Final summary:

    If you are looking for electric toothbrush charging technology solutions, welcome to contact Aiwejay, we are China’s top electric toothbrush manufacturer with independent core technology

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